Itinerant ferromagnetism entrenched by the anisotropy of spin−orbit coupling in a dipolar Fermi gas

doi:10.1007/s11467-023-1283-5

Frontiers of Physics

2023, Vol. 18

Issue (5): 52303 https://doi.org/10.1007/s11467-023-1283-5

本期目录

Itinerant ferromagnetism entrenched by the anisotropy of spin−orbit coupling in a dipolar Fermi gas

Xue-Jing Feng¹, Jin-Xin Li¹, Lu Qin¹, Ying-Ying Zhang¹, ShiQiang Xia¹, Lu Zhou², ChunJie Yang¹(

), ZunLue Zhu¹(

), Wu-Ming Liu³, Xing-Dong Zhao¹(

)

¹. School of Physics, Henan Normal University, Xinxiang 453000, China
². Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
³. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

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Abstract：

We investigate the itinerant ferromagnetism in a dipolar Fermi atomic system with the anisotropic spin−orbit coupling (SOC), which is traditionally explored with isotropic contact interaction. We first study the ferromagnetism transition boundaries and the properties of the ground states through the density and spin-flip distribution in momentum space, and we find that both the anisotropy and the magnitude of the SOC play an important role in this process. We propose a helpful scheme and a quantum control method which can be applied to conquering the difficulties of previous experimental observation of itinerant ferromagnetism. Our further study reveals that exotic Fermi surfaces and an abnormal phase region can exist in this system by controlling the anisotropy of SOC, which can provide constructive suggestions for the research and the application of a dipolar Fermi gas. Furthermore, we also calculate the ferromagnetism transition temperature and novel distributions in momentum space at finite temperature beyond the ground states from the perspective of experiment.

Key words： itinerant ferromagnetism spin−orbit coupling cold atom quantum simulation dipolar Fermi gas dipole−dipole interaction

收稿日期: 2023-02-07 出版日期: 2023-04-26

Corresponding Author(s): ChunJie Yang,ZunLue Zhu,Xing-Dong Zhao

引用本文:

. [J]. Frontiers of Physics, 2023, 18(5): 52303.
Xue-Jing Feng, Jin-Xin Li, Lu Qin, Ying-Ying Zhang, ShiQiang Xia, Lu Zhou, ChunJie Yang, ZunLue Zhu, Wu-Ming Liu, Xing-Dong Zhao. Itinerant ferromagnetism entrenched by the anisotropy of spin−orbit coupling in a dipolar Fermi gas. Front. Phys. , 2023, 18(5): 52303.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-023-1283-5
https://academic.hep.com.cn/fop/CN/Y2023/V18/I5/52303

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